11 Most Endangered Historic Places

Great Falls Portage

Year Listed: 2008 Location: Great Falls, MontanaThreat: Development

Significance

The Great Falls Portage, one of the best preserved and most accessible landscapes along the Lewis and Clark Trail, is a windblown, undeveloped rural area surrounded by mountains and a panorama of blue Montana skies. This National Historic Landmark marks the location where, in 1805, the historic expedition faced its most challenging obstacle —the 18-mile, 31-day portage around the Great Falls of the Missouri River.

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The National Trust's List of America's 11 Most Endangered Historic Places